content: /**
   * Copyright (c) 2016-present, RxJava Contributors.
   *
   * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in
   * compliance with the License. You may obtain a copy of the License at
   *
   * http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software distributed under the License is
   * distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See
   * the License for the specific language governing permissions and limitations under the License.
   */
  
  package io.reactivex.flowable.internal.utils;
  
  import static org.junit.Assert.*;
  
  import java.io.IOException;
  import java.util.ArrayDeque;
  import java.util.concurrent.atomic.AtomicLong;
  
  import org.junit.Test;
  import org.reactivestreams.Subscription;
  
  import io.reactivex.common.TestCommonHelper;
  import io.reactivex.common.functions.BooleanSupplier;
  import io.reactivex.flowable.internal.subscriptions.BooleanSubscription;
  import io.reactivex.flowable.subscribers.TestSubscriber;
  
  public class QueueDrainHelperTest {
  
      @Test
      public void isCancelled() {
          assertTrue(QueueDrainHelper.isCancelled(new BooleanSupplier() {
              @Override
              public boolean getAsBoolean() throws Exception {
                  throw new IOException();
              }
          }));
      }
  
      @Test
      public void requestMaxInt() {
          QueueDrainHelper.request(new Subscription() {
              @Override
              public void request(long n) {
                  assertEquals(Integer.MAX_VALUE, n);
              }
  
              @Override
              public void cancel() {
              }
          }, Integer.MAX_VALUE);
      }
  
      @Test
      public void requestMinInt() {
          QueueDrainHelper.request(new Subscription() {
              @Override
              public void request(long n) {
                  assertEquals(Long.MAX_VALUE, n);
              }
  
              @Override
              public void cancel() {
              }
          }, Integer.MIN_VALUE);
      }
  
      @Test
      public void requestAlmostMaxInt() {
          QueueDrainHelper.request(new Subscription() {
              @Override
              public void request(long n) {
                  assertEquals(Integer.MAX_VALUE - 1, n);
              }
  
              @Override
              public void cancel() {
              }
          }, Integer.MAX_VALUE - 1);
      }
  
      @Test
      public void postCompleteEmpty() {
          TestSubscriber<Integer> ts = new TestSubscriber<Integer>();
          ArrayDeque<Integer> queue = new ArrayDeque<Integer>();
          AtomicLong state = new AtomicLong();
          BooleanSupplier isCancelled = new BooleanSupplier() {
              @Override
              public boolean getAsBoolean() throws Exception {
                  return false;
              }
          };
  
          ts.onSubscribe(new BooleanSubscription());
  
          QueueDrainHelper.postComplete(ts, queue, state, isCancelled);
  
          ts.assertResult();
      }
  
      @Test
      public void postCompleteWithRequest() {
          TestSubscriber<Integer> ts = new TestSubscriber<Integer>();
          ArrayDeque<Integer> queue = new ArrayDeque<Integer>();
          AtomicLong state = new AtomicLong();
          BooleanSupplier isCancelled = new BooleanSupplier() {
              @Override
              public boolean getAsBoolean() throws Exception {
                  return false;
              }
          };
  
          ts.onSubscribe(new BooleanSubscription());
          queue.offer(1);
          state.getAndIncrement();
  
          QueueDrainHelper.postComplete(ts, queue, state, isCancelled);
  
          ts.assertResult(1);
      }
  
      @Test
      public void completeRequestRace() {
          for (int i = 0; i < 500; i++) {
              final TestSubscriber<Integer> ts = new TestSubscriber<Integer>();
              final ArrayDeque<Integer> queue = new ArrayDeque<Integer>();
              final AtomicLong state = new AtomicLong();
              final BooleanSupplier isCancelled = new BooleanSupplier() {
                  @Override
                  public boolean getAsBoolean() throws Exception {
                      return false;
                  }
              };
  
              ts.onSubscribe(new BooleanSubscription());
              queue.offer(1);
  
              Runnable r1 = new Runnable() {
                  @Override
                  public void run() {
                      QueueDrainHelper.postCompleteRequest(1, ts, queue, state, isCancelled);
                  }
              };
  
              Runnable r2 = new Runnable() {
                  @Override
                  public void run() {
                      QueueDrainHelper.postComplete(ts, queue, state, isCancelled);
                  }
              };
  
              TestCommonHelper.race(r1, r2);
  
              ts.assertResult(1);
          }
      }
  
      @Test
      public void postCompleteCancelled() {
          final TestSubscriber<Integer> ts = new TestSubscriber<Integer>();
          ArrayDeque<Integer> queue = new ArrayDeque<Integer>();
          AtomicLong state = new AtomicLong();
          BooleanSupplier isCancelled = new BooleanSupplier() {
              @Override
              public boolean getAsBoolean() throws Exception {
                  return ts.isCancelled();
              }
          };
  
          ts.onSubscribe(new BooleanSubscription());
          queue.offer(1);
          state.getAndIncrement();
          ts.cancel();
  
          QueueDrainHelper.postComplete(ts, queue, state, isCancelled);
  
          ts.assertEmpty();
      }
  
      @Test
      public void postCompleteCancelledAfterOne() {
          final TestSubscriber<Integer> ts = new TestSubscriber<Integer>() {
              @Override
              public void onNext(Integer t) {
                  super.onNext(t);
                  cancel();
              }
          };
          ArrayDeque<Integer> queue = new ArrayDeque<Integer>();
          AtomicLong state = new AtomicLong();
          BooleanSupplier isCancelled = new BooleanSupplier() {
              @Override
              public boolean getAsBoolean() throws Exception {
                  return ts.isCancelled();
              }
          };
  
          ts.onSubscribe(new BooleanSubscription());
          queue.offer(1);
          state.getAndIncrement();
  
          QueueDrainHelper.postComplete(ts, queue, state, isCancelled);
  
          ts.assertValue(1).assertNoErrors().assertNotComplete();
      }
  }
  